Gantz: O Trailer - 2017 Animated Science-Fiction Movie Subscribe for more: http://www.youtube.com/subscription_center?add_user=NewTrailersBuzz About the Gantz: O Movie Trailer The 3DCG film will cover the manga's Osaka Arc. Gantz: O (styled GANTZ:O) is a 2016 Japanese CGI anime science fiction action film directed by Yasushi Kawamura, produced by Digital Frontier, written by Tsutomu Kuroiwa and based on the manga series Gantz written and illustrated by Hiroya Oku.